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program WatchConsoleSize;
(* This console-mode program for Linux or other unix implementations reports *)
(* on the initial console size and outputs a message every time it gets a *)
(* SIGWINCH indicating that the console window has been resized. *)
(* *)
(* It DOES NOT attempt any formatted output using escape sequences etc. MarkMLl *)
uses
SysUtils, Keyboard, Crt, TermIO, BaseUnix;
var
signalCount: integer= 0;
procedure reportSize;
var
winSize: TWinSize;
begin
Write(signalCount, ': ');
FillChar(winSize, sizeof(winSize), 0);
if IsaTty(StdInputHandle) = 1 then
if fpioctl(StdInputHandle, TIOCGWINSZ, @winSize) >= 0 then
Write(winSize.ws_row, ' x ', winSize.ws_col);
WriteLn;
signalCount += 1
end { reportSize } ;
procedure winchHandler(sig: longint; {%H-}info: PSigInfo; {%H-}context: PSigContext); cdecl;
begin
case sig of
SIGWINCH: reportSize
otherwise
end
end { winchHandler } ;
function hookWinch(): boolean;
var
action: SigActionRec;
begin
FillChar(action{%H-}, SizeOf(action), 0);
action.Sa_Handler := @winchHandler;
action.Sa_Flags := SA_SIGINFO;
hookWinch := fpSigAction(SIGWINCH, @action, nil) = 0
end { hookWinch } ;
begin
WriteLn('This header line comprises 50 characters plus EOL.');
WriteLn;
WriteLn('Press key to terminate.'); // http://ars.userfriendly.org/cartoons/?id=20030128
reportSize;
if not hookWinch() then
WriteLn('Failed: SIGWINCH not hooked, error ', fpGetErrNo)
else begin
while not KeyPressed() do
Sleep(10);
ReadKey
end;
WriteLn('It ends here.')
end.
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